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Irritable bowel syndrome (IBS) is defined as recurrent abdominal pain or discomfort that occurs in association with altered bowel habits over a period of at least 3 months. The disorder is classified into three main subtypes, according to the predominant bowel habits presented: constipation-predominant IBS (IBS-C), diarrhea-predominant IBS (IBS-D), and mixed-presentation IBS (IBS-M). IBS is among the most common gastrointestinal disorders, with an estimated pooled international IBS prevalence rate of about 11.2%.